Fix uninitialized variable causing crash when using shiboken.delete

The isQAppSingleton flag was not initialized, meaning that any shiboken
wrapper could be randomly considered as a QCoreApp one.

Pick-to: 6.2 5.15
Change-Id: I96c836762a2ad2a6e8978dee10965c086bd50645
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/sources/shiboken6/libshiboken/basewrapper.cpp b/sources/shiboken6/libshiboken/basewrapper.cpp
index 79a80f3c0..0070af672 100644
--- a/sources/shiboken6/libshiboken/basewrapper.cpp
+++ b/sources/shiboken6/libshiboken/basewrapper.cpp
@@ -582,6 +582,7 @@ static PyObject *_setupNew(SbkObject *self, PyTypeObject *subtype)
     d->parentInfo = nullptr;
     d->referredObjects = nullptr;
     d->cppObjectCreated = 0;
+    d->isQAppSingleton = 0;
     self->ob_dict = nullptr;
     self->weakreflist = nullptr;
     self->d = d;